Sea grapes are a type of green algae that have not been widely used and are included in seaweed. Seaweed is reported as edible algae, has bioactive substances such as anti-bacterial, anti-fungal, anti-tumor, and can be used to treat high blood pressure and goiter. This study aimed to determine the antibacterial activity of sea grape extract (Caulerpa lentillifera) against Escherichia coli a…